<template>
    <div class = "login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="logo">
            </div>
            <!-- 表单区域 -->
            <el-form  ref = "loginFormRef" label-width="0px" class="login_form" :model="loginForm" :rules="loginFormRules">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input prefix-icon="el-icon-user" v-model="loginForm.username" ></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input prefix-icon="el-icon-lock" v-model="loginForm.password" type="password" prop="password"></el-input>
                </el-form-item>
                <!-- 按钮 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                    <el-button type="success" @click="registerDialogVisible = true">注册</el-button>
                </el-form-item>
            </el-form>
        </div>
        <!-- 注册对话框 -->
        <el-dialog
            title="新用户注册"
            :visible.sync="registerDialogVisible"
            width="50%"
            @close="registerUserClosed">
            <!-- 对话框内容主体 -->
            <el-form :model="registerForm" :rules="registerFormRules" ref="registerFormRef" label-width="70px">
                <el-form-item label="用户名" prop="username">
                    <el-input v-model="registerForm.username"></el-input>
                </el-form-item>
                <el-form-item label="密码" prop="password">
                    <el-input v-model="registerForm.password"></el-input>
                </el-form-item>
            </el-form>
            <!-- 对话框底部 -->
            <span slot="footer" class="dialog-footer">
                <el-button @click="registerDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="register">确 定</el-button>
            </span>
        </el-dialog> 
    </div>
</template>

<script>
    export default {
        data() {
            return {
                // 登录表单的数据绑定对象
                loginForm: {
                    id:"",
                    username:'admin',
                    password:'123456'
                },
                registerForm: {},
                // 表单的验证规则
                loginFormRules:{
                    username: [
                        { required: true, message: '请输入登录名', trigger: 'blur' },
                        { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                    ],
                    password: [
                        { required: true, message: '请输入登录密码', trigger: 'blur' },
                        { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                    ]
                },
                registerFormRules: {
                    username: [
                        { required: true, message: '请输入登录名', trigger: 'blur' },
                        { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                    ],
                    password: [
                        { required: true, message: '请输入登录密码', trigger: 'blur' },
                        { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                    ]
                },
                registerDialogVisible: false
            }
        },
        // 重置按钮，重置登录表单
        methods:{
            resetLoginForm() {
                this.$refs.loginFormRef.resetFields();
            },
            login(){
                 this.$refs.loginFormRef.validate( async (valid)=>{
                    if(!valid) return;
                    const {data:res} = await this.$http.post("user/login", this.loginForm);
                    if (res.code !== 200) {
                        return this.$message.error("登录失败");
                    }
                    // 保存服务器返回的token 到会话中
                    window.sessionStorage.setItem("token", res.data.token);
                    // 编程式的跳转
                    this.$router.push("/home")
                });
            },
            register() {
                this.$refs.registerFormRef.validate(async valid => {
                    // valid 是根据rules="addFormRules" 是否校验通过
                    if (!valid) return this.$message.error("注册信息不符合规范");
                    // 发起请求
                    const {data:res} = await this.$http.post('user/insert', this.registerForm);
                    if (res.code !== 200) {
                        console.log(res);
                        return this.$message.error(res.meg);
                    }
                    this.$message.success("注册成功");
                    // 关闭添加对话框
                    this.registerDialogVisible = false;
                    // 重新获取页面列表
                    this.loginForm = res.data;
                })
            },
            registerUserClosed() {
                this.$refs.registerFormRef.resetFields();
            }
        }

    }
</script>

<style lang="less" scoped>
    .login_container{
        background-color:#2b4b6b ;
        height: 100%;
    }
    .login_box{
        width: 450px;
        height: 300px;
        background-color: #fff;
        border-radius: 3px;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        .avatar_box{
            height: 130px;
            width: 130px;
            border: 1px solid #eee;
            border-radius: 50%;
            padding: 10px;
            box-shadow: 0 0 10px #ddd;
            position: absolute;
            left: 50%;
            transform: translate(-50%, -50%); 
            img {
                width: 100%;
                height: 100%;
                border-radius: 50%;
                background-color: #eee;
            }
        }
    }

    .btns {
        display: flex;
        justify-content: flex-end;
    }

    .login_form {
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }
</style>
